FERRITE MAGNETIC MATERIAL, FERRITE SINTERED MAGNET, AND MOTOR
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United States of America Patent
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Jun 18, 2015
app pub date -
Aug 1, 2013
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Aug 1, 2012
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Abstract
A ferrite magnetic material and ferrite sintered magnet composed thereof have a ferrite having a hexagonal crystal structure as a main component. A composition ratio of a metallic element included in the main component is represented by: RxA1-x(Fe12-yCoy)z. R is at least one element selected from La, Ce, Pr, Nd and Sm and at least includes La. A is at least two elements selected from Ca, Sr and Ba and at least includes Ca and Sr. Si component and either or both of Al component and Cr component are included as a sub-component. When a sum of Al content and a value obtained by dividing Cr content by four and a value obtained by calculating the formula [(R+A)−(Fe+Co)/12]/Si where R, A, Fe, Co and Si indicate values of each atom % thereof are defined as L and G, respectively, L and G have to be values within a predetermined region.
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